Episode 4 of Interior Chinatown unfolds with Willis fully embracing his role as the tech-savvy expert. In the solitude of his room, he dives into a search for files pertaining to his brother, and to his astonishment, unearths a treasure trove of recordings featuring the enigmatic "Kung Fu Guy." As he watches these clips, memories of his brother teaching him kung fu maneuvers flood back, evoking a nostalgic trip down memory lane for Willis.
Later, Willis and Lana share an intimate moment, watching the recordings like a captivating film marathon, complete with the quintessential popcorn. Through these videos, they uncover a startling revelation: Willis's brother had been working undercover for the police in a clandestine operation.
After Lana departs, Willis stumbles upon a folder titled "Operation Kung Pao," brimming with recordings of his brother in secret meetings with the mysterious painted faces. His heart races with disbelief as he ponders whether his brother could have been the elusive leader of the painted faces. His suspicions intensify when he witnesses his brother committing a heinous act—murdering a cop who was once his partner. In a desperate bid to safeguard his brother's reputation, Willis erases all traces of his brother from the police database and retreats to his home.
Back at his residence, still haunted by the harrowing scenes he witnessed, Willis's mind reverts to the tape containing his brother's voice. Using the ambient sounds as a guide, he embarks on a poignant journey to reconstruct his brother's final moments. The recording unveils a chilling conversation, where his brother insists he didn't know the identity of the painted faces, while mentioning eerie lights and cameras surrounding him.
Guided by these clues, Willis finds himself descending through a trap door and navigating a labyrinth of tunnels, ultimately emerging in Uncle Wong's room at the restaurant.
