Park Chaekyung is Yoo brothers' half sister. Before Mr. Park died, he asked Chaekyung to meet her brothers. At first Chaekyung refused because she met Yoochun once along with their father and he didn't even look at her.   Will Yoo brothers finally accept her or,, will Chaekyung suffering more?

It's not a separation, it's just.. our love is timeless.