Netizens' Assumption
Seolhyun began to date Yook Sungjae in early 2015. However, Zico loved Seolhyun and has expressed his love actively. Eventually, Seolhyun has broken up with Yook Sungjae last March and became Zico's girlfriend.
Evidence
1. At his concerts held last year, Yook Sungjae said again and again on the stage, "Don't I look like a prince?" The lyrics of Seolhyun's part of "Heart Attack" is, "Oh my prince."
2. At the ending of 2015 KBS song festival, kpop singers such as Ailee, BTS and VIXX tried to let Seolhyun and Yook Sungjae be close to each other.
3. When Zico appeared in "Radio Star" last January, he said, "I have an unrequited love for a female celebrity and I have been dumped twice. But I'm
not gonna stop loving her." Yeah, it is Seolhyun.
4. Zico has recently written many songs about an unrequited love. A notable example is Block B's "Toy."
5. Last April, Yook Sungjae posted the lyrics of One Direction's "History" on his instagram. The lyrics is like this. "
You've gotta help me. I'm losing my mind. Keep getting the feeling. You wanna leave this all behind," "Now my heart's breaking. And I don't know what to do. Thought we were going strong. Thought we were holding on. Aren't we," "All of the rumours, all of the fights. But we always find a way to make it out alive. Thought we were going strong. Thought we were holding on. Aren't we," "Cause' the truth is out, I realize that Without you here life is just a lie. This is not the end. This is not the end. We can make it, you know it, you know."
6. In the music video of Zico's "I am you, You are me," you can see the time changes.
Yook Sungjae's birthday is May 2 and Seolhyun's birthday is January 3, while Zico sings, "I'll treat you nicely so that your obsessive ex-boyfriend will be out of your hair."
Well, what do you think? Do you think it's reliable? :)