Leo, the son of a wealthy family, is the silent and shy adopted brother of the cool and regal Sui. When they were born, their parents predicted they would be wed, and after Leo's parents died he joined the family officially, but his relationship to Sui changed forever.
Leo and Sui have been "engaged" since their parents introduced them in childhood... but in the years that followed, they were barely even friends.
That is, until much later, when Leo's parents passed away and he was adopted into Sui's family. As the "brothers" grew closer in adulthood, they could no longer resist their attraction to each other... and yet, they remain unwed.
Ignoring the pressure from Sui's parents to tie the knot, the two live together in blissful sin. Despite Leo's encouragement, Sui resists the urgency of marriage, hoping to keep his adorable betrothed all to himself just a little longer...