'My one and only something'

A 19 year old girl named park Taemin has a boyfriend. Kim Taehyung from BTS. Taemin finds out he is cheating on her and breaks up with him. She thanked her friend Yoona for telling her what Taehyung did to her.
On the other hand Jungkook Yoona's boyfriend finds out Yoona was texting another boy and never knew it was Yoona's brother. After still not knowing, Jungkook breaks up with Yoona, until Taemin tells Jungkook who the boy yoona is texting is.
Also Taemin becomes a Koreon idol. Read more to find out what happened to Taemin and which KPOP group she joined. And read more to find out what happens to yoona. Enjoy!!!