Oh Sehun

A basketball player of his school. Married to his sunbae, Joohyun. Naughty and love to tease Joohyun. Could be totally mad in love when he privately with Joohyun. His love towards his wife grew bigger day by day. The feeling make him more protective. Having a difficult times when Joohyun lost her memory because of tumour. A memory only about him. Fighting to bring back the old Joohyun. 

Bae Joohyun

One of the popular sunbae in school. Clever and very open-minded. She loved to curse but only for Sehun. Being weak by Sehun sweet action. Have a boyfriend that she attached since three years ago, Suho. She tried to forget Suho when he suddenly left. Opened her heart to Sehun but on her way to give love, Suho came back. Thirsting for her love back. She lost about Sehun. Fight herself to live as her tumour become more worst. 

Suho Kim

Joohyun ex boyfriend. Leaving to America after graduated. Same age as Joohyun but he was an upper student as he was one of the clever boy. He came back to find Joohyun. But too late, she's married. Suho didn't care when he wanted to steal Joohyun back from Sehun.

Jung Soo Jung

A cute, hyper and happy go lucky girl. Joohyun cousin. She also Sehun's childhood friend. Kept a feeling on Sehun since kid. Admitted that he was her's.