Xie Chongji was madly infatuated with someone for the first time when he was in college. He desperately pursued a frivolous man. It was clear that he would not refuse anyone who came, but he tried his best to catch up with him. He thought he could settle down with this person, but he didn't expect that the other person would leave without saying goodbye. And love is something that always leaves no trace when experienced, and becomes more unforgettable after missing the separation. He indulged himself and allowed himself to be soaked in various emotions until they rotted away. Until his parents were unfortunately killed and met a man who treated him tenderly at the funeral. Living under the same roof, the relationship slowly heats up. But when he thought everything would be peaceful, he was surprised to find that his new cohabitants were his ex-boyfriend and his current boyfriend. And it all started in such a room, surrounded by four complicated people.