Lee Eun keeps a close eye on Deok Su, who possesses the golden key, waiting for the right moment, while Deok Su grows more cautious, noticing Eun's suspicious looks. Meanwhile, a murder case involving a fake Hongpae shakes Yongcheonru, raising the tension even higher.

The "However 4" are fighting hard to pass their test, but Choi Sang Bang is scheming to kick them out. Meanwhile, Lee Eun Ho watches Deok Su closely to check for the golden key, but this makes others start to doubt who Eun Ho really is.

Amidst suspicions about their identities, Eun-ho and Deok-su develop confusing feelings for each other. Meanwhile, Jun-hwa uncovers a great secret.