Yu Ruoxuan, a school beauty from the Department of Finance, was entrusted by her brother to the care of his friend Gu Yan. He was calm and gentle, making her fall in love. It wasn't until the main wife came to the door that she realized that she had become the "third party". He concealed his marriage history step by step, and she fell in love with lies until her body was completely covered. In this hunt that started with calculation, who fell into whose cage?