My childhood friend is EXO

A girl called Hana. She had a childhood friend. He is Chanyeol. They really close. But one day, Hana is emigrating to state with her family. They promised each other that they won't forget each other. After 15 years, Hana did not forget anything about her and chanyeol. She came back to Korea. To find him. Chanyeol now is an idol in a famous K-pop group called EXO. He's an idol but she's just a normal girl. Hana knows that she doesn't fit him anymore. She promised that she will come back to Korea and be chanyeol's wife in the future. But unfortunately, Chanyeol had a girlfriend. He said it was just a rumor. But is it just a rumor? Let's find out.