Your boyfriend Dohyun is a real manipulator and psycho. And you didn’t immediately understand this. Only after years of relationship, you realized who he really is, but it's too late to run away. Dohyun is obsessed with you because you’re the only one who showed him love. Seeing you cry over his childhood story made him realize that he would never let you go and that you would only cry for him from now on. That's why he now poured boiling water over his hand on your words about breaking up.