Main Characters :

No Sun Woo- the son of Minwoo and Hye Rin in  "i want boyfriend to be my boyfriends". He promised that he will not fall in love with Hyun Min, but will that promise stay long?

Jo Hyun Min- the daughter of Hyun Ri and Kwangmin in  "i want boyfriend to be my boyfriends". She went to a coed school which was an all-boys school a year ago and it turns out that she's the only girl in her classroom.

Lee Minho- a bully who fell in love with Hyun Min.

Choi Seul Ho- the son of Minseul and Minho in "i want boyfriend to be my boyfriends". He is always observing one's attitude and reads books often.

Kim Ki Ra- the daughter of Key and Hae Re in "i want boyfriend to be my boyfriends". She is the smartest in the group, she always thinks of others than herself.

Cho Kyu Young- the son of Kyuhyun and Young Hyun in "i want boyfriend to be my boyfriends". He is a gentleman and treats girls very manly.

Jo Hye Rin- she is the daughter of Youngmin and Hye Min in "i want boyfriend to be my boyfriends". She gives advises to her friends and always thinks positive.

Others :

Kwang Ri- Hyun Min's younger brother.

Kido, Seung Jo, & Henri- Minho's friends

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Two children promised that they will not fall in love with each other. The reason why is because Sun Woo's appa (Minwoo) and Hyun Min's umma(Hyun Ri) had a relationship when the were young so decided not to follow their experiences. But, what will happen if they were both living in one room? Will something happen?