A Murderous Affair in Horizon Tower Episode 4

Detective Zhong asks Lin Da Sen about the mattress and he says Mei Bao had trouble falling asleep so he bought her a bed. He eventually admits that she seduced him and they had an affair, during which he got her the loft she stayed at. They then bring Mo Li in for questioning. She tells Yang that her marriage is an unhappy one and Da Sen has stolen her designs. She says that because she is a woman, her father didn't think she could inherit his company so he allowed the plagiarism to go on and helped Da Sen. Eventually, Mo Li gave up her career in order to get pregnant. Mei Bao's phone logs show three frequent numbers; Lin Da Sen, Xie Bao Luo, and an unknown number. The number seemingly belonged to Mo Li. (Source: Autumn carrot at MyDramaList)