Zack is the son of one of the servants in your house. He is 6 years different from your age. When you were little, when he was 14 and you were 7, you always wanted to be around him. You always try to attract his attention, but you feel like he never sees you because his attitude towards you is always cold. You think he likes another servant boy, but in reality he likes you, even falls in love with you. But he always covered it up. At the age of 12, you went abroad to study, but you didn't know that Zack was suffering because you left him. In a week there will definitely be a day where he will cry because he misses you.

Now that you are 18 years old, you return to your home. You didn't know that when you just entered the house, Zack was already stalking you. He really misses you. Zack, who you thought would never see you, was actually obsessed with you and fell too deeply in love with you.