He Cheng is a very tall and muscular man. He is noticed to be very handsome. He looks very much like his younger brother, He Tian, as noted by Mo Guan Shan to have "familiar features" when the latter saw him for the first time. He is further noted that he might be around 29 or 30 years old.
His aura is also described by Guan Shan to be "familiar" at their first interaction, described to be exactly like He Tian's, akin to "danger, even with the slightest provocation". He is also further described as someone who gives off "bad vibes".
He Cheng was sent by Jian Yi’s father to kidnap Jian Yi but was thwarted by Jian Yi's mother. Later He Cheng's coworker "Qiu" was send to rescue Jian Yi from a man who kidnapped him. The kidnapper tried to get in contact with Mr. Jian trough his actions.
He Tian's homeroom teacher contacted him to inquire about what happened on a day that He Tian was absent in school and also did not answer his phone. He Cheng then visited He Tian and started knocking loudly on the door, the latter mistaking him for a housekeeper and chasing him off, but eventually let him in. He Cheng found that that He Tian had a fever and wanted to take him to the hospital. He Tian protested at first but he was dragged by He Cheng into the latter's car. He Cheng stopped He Tian when he was trying to force his way out of the car.
He Cheng asked He Tian about Jian Yi, whom He Tian quoted is his "friend" and to "not get any ideas". He Tian then stated that He Cheng had become the type of person he hates the most. He Cheng caught He Tian by the arm when the latter almost fell to the ground due to his fever. He Cheng then told He Tian to head back to the car as the wind was too strong.
He Cheng passes by Guan Shan when he was buying sandwiches at the same store for He Tian. Mo Guan Shan ran away after seeing He Tian in the car and pondered about He Cheng when he reached a safe place. Due to He Cheng resembling He Tian, from appearance to even the aura, and also his young age, Mo Guan Shan thought that He Cheng was the "teenage dad" of He Tian.
- He told He Tian that if he wanted to protect others, that he had to become the strongest.
- He Tian's school file only had He Cheng's phone number in it.
- Mo Guan Shan notes that He Cheng drives a 'luxury' car.