Each to their own opinion but I just can't fathom SooAh and Saeroyi as endgame. And while the idea of them is nice because they have history that goes way back, and how awesome would it be to end up with the one person who has been there since the beginning of your struggles. But the reality is that they were just not meant to be. And honestly, SooAh is just not ideal for someone like Saeroyi. Homeboy has been through hell and back, he has seen the darkest of the night, felt the greatest pain and losses. He does not need someone unpredictable like SooAh who if given the chance, will drop Saeroyi without hesitation if she were to be offered something of greater importance. What someone like Saeroyi needs, is loyalty. Of course Saeroyi is smart and thinks ahead, reason why he made a plan. But he was simply too vanilla (for a lack of better word) He needed someone just crazy enough to carry it out, and Yiseo was like the missing piece to his puzzle that he's been looking for all along. She was young, ambitious, and clever but most of all, she was loyal to the core. She wasn't wishy washy with what she wanted but made it clear multiple times she is dedicated to this one man and when everyone else just watched and hoped for the best, Yiseo not only fought with him, but she turned his dream into a reality!

And at the same time, it also benefitted her. I know some people might feel like she does nice things only to get on Saeroyi's good side, but for a sociopath like her who before, cares about no one but only winning, to want to become better because of Saeroyi, or even just do nice things for others because of him, I think that's already pretty great in itself.

All in all, these two really complements each other. For Saeroyi, someone whose had a rough life to have someone completely dedicated by his side, and for someone like Yi-seo who lacks empathy for others, but to meet Saeroyi and just feel for this guy, his perseverance and determination, and to want to bring happiness to this dude, but also wanting to do better things because of him. Chefs kiss.

I'm also really tired of the first love = true love trope, so I am glad he ended with Yiseo. It proves that time isn't a measurement of love. No matter how long Saeroyi has known SooAh and clung onto her, Yiseo+Saeroyi proves that love is built through loyalty, teamwork, trusting in each other and having one another's back. All of which Saeroyi's and SooAh's relationship lacked even though they had the advantage of knowing each other longer.