Kim Roksoo/Cale Henituse is such a comfort character. He's to me what Yoo Jonghyuk was to Kim Dokja. And I love Yoo Ryeo Han-nim for creating a character like him.
Kim Roksoo is all about resilience and tenacity. He's the living embodiment of how you shouldn't give up no matter how hard life gets. His life was downright horrible in every possible way. Just when you'd think it couldn't get worse, it does. He was finally starting to see hope in that lonely life when all hope was lost in the apocalypse. What could be more devastating? But he found a sliver of hope in his saviour and made reaching him his goal. Even though his ability wasn't suited for the battlefield he still signed himself up for the Body side to stay closer to Lee Soo Hyuk.
When his second family left him, it would have been so easy for him to just give up and let himself die. It wouldn't have taken much effort. Yet he persevered just because of the promise he made to Lee Soo Hyuk.
No matter how cruel life was to him, he always persevered. He was orphaned at an early age, abused by his guardian, hunted down by otherworldly entities (though he didn't remember that part), everybody he tried to get close to left him, right before he could make something out of his life the apocalypse hit them, his entire team was annihilated right in front of his eyes. It just kept getting worse and worse.
However, it's because he endured it and moved forward that he was able to achieve happiness. If he had given up somewhere along the way, had he never lived to be 36 years old as Kim Roksoo, he would never have been transmigrated into the body of the 18 years old Cale Henituse and gotten a second chance at life. He would never have gotten to meet the new people he calls his family. Nor would he have been able to meet his old family members, Lee Soo Hyuk and Choi Jung Soo, again. All of this was possible because he lived.
The key takeaway of Kim Roksoo's life and journey is that life will get better if you just keep living it. If it's not looking good now, maybe the point hasn't come yet. So don't be disheartened and give up on life. Because, as Lee Soo Hyuk said, being alive is the best.
