A young couple has recently purchased their dream house and are expecting a baby. One day, while his wife is out, an ex-girlfriend arrives at the door drenched from rain. She had heard of his wife's pregnancy and had only come to sell the couple insurance. The husband allows her to take a shower in his home. Suddenly, his in-laws arrive at the home unexpectedly, and he must find a way to get his ex-girlfriend out of the home without his in-laws noticing and before his wife comes home.

Liu Zhi, a young man, depressed and trapped in a loveless marriage with a dominating girl, meets Baober (an ageless young girl) on a Beijing street one day. They fall in love and start to live a strange, mysterious life....