why did he suddenly go from crying to blushing?? ugh but the characters look so smash here

That's why both of them are complex characters, u cant rule out taeui as a saint that "omg he has stockholders syndrome" or "taeui needs help" vice verse to ilay of being painted as this or that, both are very complex BOTH not sane nor saint so yes it takes time to truly figure out their character if u look in depth into their character :))