They had grew up and graduated. Chou Tzuyu is the nation's sweet heart and hopes of winning their first women swimming gold medal in Olympics.

Sana undoubtly grown more beauty and very intelligent. At the age of 21, she had already make a name in Paris as the most youngest fashion designer invited to the Paris Fashion Week and already launching her own brand; "Sapphire" with her business partner and also her college roomate, Im Nayeon. She's the brain while Nayeon the money maker. Through Nayeon relationship with Jeongyeon, the young heir of Im Communications finally knew the reason as to why her roomate never dated back in college; the young designer is still in love with her high school lover; the swimming genius. Nayeon came up with a brilliant plan.

Get the two back together.

But there's a slight problem; Park Jihyo is not happy. She won't let Sana dwell in sadness the way she did 3 and half years ago.

Plus Yi Tian is not happy too. Can the two long lost lovers find happiness once again?