Shi Yu's neighbor who lives on the 18th floor. He likes fitness and usually works out at home for over an hour around 5 p.m. after work. He messaged Shi Yu this morning saying he planned a long workout and would warn him on the phone if it was noisy. His bike was parked in the garden, indicating he was back home, but he did not start working out and did not reply to Shi Yu's messages, which was unusual since he was very talkative.
