sunghoon is your boyfriend you guys dating and you guys love each other

But Suddenly he change when found out that his ex had a heart disease so you agree that he can take care of his ex,but after a while he's so cold at you and just go home in the middle of the night because he's always on the hospital taking care of his ex,while you always waiting for him but he just ignored you or reasons that he's so tired

One night,he come home just go straight to his room ignoring your presence