Hes always badass. He was just grieving, bro. Moreover his love of life choose to divorce him because the dead of their son that "allegedly" hate him. I doubt even the stronger can survive that.
I can't help that I forgot this is set in a post-apocalyptic world that I was shock they did all this, I'm not even mad at Guwon, I genuinely forgot the setting
Bro, has better eyelashes than me I swear