Even though Luka knows he and Adrien were talking about Marinette hiding something even she doesn't fully understand is causing her so much distress, hearing Adrien say "I wonder if you can love someone fully if you don't know them completely", hit Luka hard since he now knows Marinette's hidden life as Ladybug interfered with their relationship back in "Truth". Luka wanted to know what she was hiding to better help her and sort out the troubles between them, but now that he knows it was Marinette's duty as a hero that left her no other choice but to end their relationship, Luka realizes that Adrien cannot afford to make the same mistake he did by constantly worrying and wondering about what Marinette could be hiding.
(Marinette broke up with Luka back in "Truth" due to the risks of her hero life)
Knowing now that Adrien and Marinette are currently unaware of each others secret identities as Ladybug and Cat Noir, Luka is worried they will face a rough patch in their relationship the more they realize they are hiding things from each other, so in order to ease Adrien's worry, Luka explains to him that its very common for someone to not know another person completely immediately, everyone acts differently when they are in the presence of others, everyone has all sorts of sides to themselves others don't know about just yet, but that doesn't change how they see each other.
Luka has all sorts of sides Adrien has not seen yet, but that doesn't change the fact that they are good friends. Adrien in turn knows people are not yet aware of his more clownish personality, its a part of himself he only tends to express when he is Cat Noir, but that doesn't change the fact that people know he is a kind hearted person. And even though Adrien is unaware of what Marinette is hiding that is causing her so much distress to the point of preventing her from accepting his affection and confessing her feelings, it doesn't change the fact that they are already aware that they love each other and want to get to know each other, its just going to take time to learn and understand the parts of each other they don't know about just yet, but they will eventually.
Luka learned the hard way that even though anyone can change,not everyone wants to. Jagged was willing to sacrifice his rich lifestyle to commit to being a better father, while Bob was not as willing to make similar sacrifices to be a better person/record producer.
Ever since Luka found out about Ladybug and Cat Noir’s identities, Luka had done the best he could to ensure that no matter what he knew about the two heroes, he wouldn't let it affect him in any negative way as he was fully aware that Monarch was constantly on the prowl for negative emotions. Instead, Luka had decided to look at his new knowledge in a different light.
In “Migration”, when Marinette looks to Luka for advise about her troubles, she does at first feel guilty for asking him for help on account of that she broke his heart back in “Truth”. However, knowing now that it was because of the weight of Marinette’s responsibilities as Ladybug that ultimately left her no other choice but to break up with him, Luka had learned to make peace with their past relationship, after all, he got his answer as to why their relationship struggled, and in the end, Luka understood it was neither his nor Marinette’s fault they broke up. They both agreed to start a relationship, but inevitably realized that things between them just couldn't work out as a result of their personal matters.
(Luka quickly realizing back in “Truth” that Marinette is unable to commit to their relationship, but had no idea why)
Rather than succumb to the pain of his broken heart, Luka had decided to learn from his experience, allowing him to not only look past the troubles of his relationship with Marinette to repair their friendship, but to also learn a little more about himself throughout the whole process, inspiring him to even make new songs that were sometimes sad, and other times cheerful.
Realizing now that Marinette and Adrien were just doing the best they could with the life they were living, as both civilians and heroes, Luka had decided that if either of them felt troubled about their lives, they would at least know that he would always be there for them. If they needed him, they knew where to find him, and as we saw in “Migration”, the two would do just that, never knowing Luka knew the struggles they were hiding behind their secret lives. However, from what we now understand, they were not the only ones Luka was helping.
Due to Luka’s caring and insightful nature, many people looked to him as someone who could help them sort out their troubles and complicated feelings. And more often than not, the people he talked to were able to gain some much needed insight about their lives and obtain good advise from him about how to deal with their problems. For Luka, it was normal to see people make an effort to better themselves, and if he was able to look past peoples differences to help them and himself be a better person, then he was willing to trust that others were also able to make the effort to take what they had learned about themselves, with or without his help, and strive to change themselves for the better, rather than let their past actions and choices take the better of them. Unfortunately, what ultimately sealed Luka’s downfall, was his willingness to look past peoples differences and mistakes, and trust that if they were willing to acknowledge themselves, then they deserved just as much a chance as anyone.
(Bob attempts to convince everyone he has turned a new leaf and is willing to change things for the better)
When Bob Roth realized it would be no easy feat to recruit Luka, he decided to take advantage of Luka’s kind nature by making it seem like he wanted to take Luka’s word on the matters of changing and was now capable of admitting that he was not always honest to people like Anarka in the past, let alone to Kitty section when he promised them a record deal back in “Silencer”. By making it seem like he was willing to set aside his past to focus on being a better man, and a better record producer who would do everything he could to provide Luka and his friends the attention and recognition they deserved for their hard work, Luka had decided to stick by his word that anyone can change, and even the worst of people deserved a second chance, so if Bob was willing to acknowledge his past actions and actually tell them how he planned to commit himself to making things up to them, then it was worth a shot to give him a chance as well.
However, much to Luka's dismay, Bob had no intention to change his ways and was instead willing to do whatever he could to get what he wanted, and what he wanted was to recruit Luka so he could provide him a series of new songs that would bring him a higher profit than Jagged, especially since Jagged had now attempted to focus more of his attention on his family rather than producing new songs.
(Luka’s attempts to give Bob a chance nearly get him akumatized the moment he realizes Bob had every intention to take advantage of him and destroy the band his friends worked hard to build)
Luka’s attempts to trust Bob not only narrowly got him akumatized, but it had also unfortunately put a target on his back now that Monarch was aware Luka knew of both Ladybug and Cat Noir’s secret identities. Although Ladybug and Cat Noir were able to save the day near the end, Luka had decided to take responsibility for unintentionally tipping off Monarch that he knew of the heroes identities, by deciding it be best for him to leave Paris so Monarch would be unable to track him, after all, even if Ladybug and Cat Noir managed to defeat Gold Record, Monarch still knew who he was, where he lived and who his family was.
Rather than hide things, Luka gave everyone solace in confiding with them that he needed to leave because he knew Ladybug and Cat Noir’s identities, and even though Adrien and Marinette wanted to persuade him to stay, as they were both determined to protect him at all costs, Luka knew it was not worth putting him as the top priority when the heroes top priority should be to defeat Monarch and retrieve the miraculous to free Paris. By trusting the people closest to him with his secret, without actually telling them who Ladybug and Cat Noir really were, Luka had ensured they would understand that his decision was simply something he needed to do, not just for his sake, but for the sake of everyone he cares about, something Marinette and Adrien understood well, given their hero lives revolved around making tough decisions.
Although Luka was kind enough to give anyone a chance, his experience with Bob had taught him the hard way that although anyone can change, not everyone wants to, and even though he now realizes people like Bob didn’t want to acknowledge their mistakes and sacrifice their privileges to commit to changing themselves, he understood there will always be others who will find the determination to want to be better upon realizing the error of their ways, something Luka was happy to learn his mother and father took a little more to heart.
(Jagged renounces his life of fame and fortune to focus on being a better father)
(Anarka agrees to give Jagged a chance)
Realizing that Luka was able to stand up to Bob and refuse the temptation of fame and fortune, Jagged had decided to follow his sons lead and also give up the life of fame and fortune so he could commit to being a better father for his family, after all, its just as Luka said, money and contracts are just paper, it can never replace friends and family. Anarka in turn, understood she needed to try and think of others like she would with her children and give them a chance to not only talk, but show her they are more than the people she assumed would only get on her nerves and should be thrown off her boat on sight.
With Luka away, only time will tell how his family and his friends will handle life without his presence, and with Monarch determined to obtain the information of Ladybug and Cat Noir's identities from him, no one knows what he will be willing to do the moment he realizes Luka is far out of his reach.
The teaser reveals a fairly simple plot, so far we have Bob provide the much awaited record deal to make Kitty Section an official band.
Back in "Silencer", after Bob accidentally admitted to the entire public, on live television, that he had in fact stolen Kitty Sections music to provide new material to XY, he had attempted to save himself by quickly switching the subject from stealing their music to saying it was nothing but a joke as his true intentions were to provide Kitty Section their very first record deal and give them a chance to perform live on television for the world to see. Of course, near the end of "Silencer", as Ladybug and Cat Noir hear Bob's plan to give Kitty section a chance to be recognized, Cat Noir explains that he feels skeptical about weather or not they had truly saved everyone from the bad guy(Silencer), given Bob is inherently not a very good person and could have ulterior motives in the future .
In "Determination", everyone from Kitty Section was still anxiously waiting for Bob to provide the papers for their record deal, but within the time they waited, the band, as well as Marinette, decided to spend it coming up with new ideas, such as stickers for their line of merch. However, after having waited for so long, Juleka quickly began to feel skeptical that Bob would actually carry out his promise.
However, seeing as Bob did eventually come around to bringing them their contract in "Migration", to no surprise, Bob did in fact have other plans for the band as the the group looks disappointed and surprised over what could only be the shocking fine print of the deal they just signed. Given the unfair circumstances Bob had set to take advantage of the band, the next bit with Luka tearing the contract reveals that they will not abide by his demands regardless of it potentially being their only opportunity to sign with an official record company.
Bob does of course get akumatized this episode, but of all the members of Kitty Section, Luka becomes his prime target as he continues to attempt to throw a gold record his way. We don't know what it is exactly that this golden record is capable of doing should it actually touch someone, but given it was originally papers for a record deal that would allow Bob to take full control of Kitty Section, the golden record may provide Bob with the power to take control of others. This is a problem because as we all know, Luka is the only person who is aware of Ladybug and Cat Noir's true identities, he of all people must not be captured or akumatized, but lets just wait and see what the show has to say.
