Answers: The player first sees Jianyu Zhang after the helicopter crash, and he will knock out the player. He and three soldiers are seen a second time shooting Eric Leblanc in the Resident Bunker. The player sees him in the final bunker a third time, failing to enter the gold cube. Caught outside, Jianyu Zhang is horribly disfigured with mutations. The player can discover a record of Jianyu Zhang's Puffton Corporation employment on a computer in the Guest Bunker. The record states that Jianyu is a "High-Security Risk" the document also states that Jianyu has level two security clearance and works for the security department. We learn from other evidence that Sahara Therapeutics stock has plummeted since the events of The Forest. As a direct competitor to Sahara Therapeutics, Jianyu Zhang is likely a spy conducting corporate espionage on Puffton Corporation. Why Jianyu would spare the protagonist after the helicopter crash is still unknown. However, there are subtle clues. In the very first cutscene, the player can be seen with a "Fight Demons" tattoo on their arm. It's possible that Jianyu knew of the protagonist and saw them as a means to an end.