Check in Hanyang

With different goals in mind, Lee Eun and Hong Deok Su step into Yongcheonru as interns. On their first day, they are connected through a mysterious golden key, leading to an unforeseen turn of events.

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.

Deok-su is at risk of getting figured out by the hands of a lecher. Eun-ho manages to save her and her bronze key, setting off Jun-hwa's suspicions.

Something sparks between Deok-su and Eun-ho at the honeymoon suite training. The expert apprentices accost Deok-su at bathtime to expose her identity.

Lee Eun-ho and Jun-hwa try to save Deok-su in their own ways. Convinced that the innkeeper Seol Mae-hwa is behind everything, Deok-su strikes back.
 

Avoiding expulsion, Deok-su declares war against Seol Mae-hwa. Jun-hwa takes her side. Lee Eun-ho is hit with feelings while checking in on the key.

Deok-su makes it back to Yongcheonru and continues her plan undeterred. Lee Eun-ho pushes down his feelings and helps Jun-hwa profess his love.

Lee Eun-ho can't help but note Deok-su and Jun-hwa's chemistry. A food stall owner is invited to Yongcheonru for quality time but runs into someone.

Deok-su approaches Cheon Bang-ju, vowing revenge, and Cheon Bang-ju questions Seol Mae-hwa about Deok-su's true identity. Meanwhile, Lee Eun-ho accepts the fate of having to get engaged to Byeong-pan's niece in order to carry out his plan...

Eun-ho Lee and Deok-su come into conflict over a pair of brass and gold coins that they finally got their hands on, and new facts are revealed. Meanwhile, Jun-hwa goes to see Eun-ho Lee and warns him to let Deok-su go...

Eun-ho Lee and Deok-su have confirmed their feelings for each other. Now, they believe that everything will be resolved if they just find the safe. However, when Deok-su's life is threatened, Eun-ho Lee makes a final decision to protect Deok-su...

Deok-su is shocked to learn of Eun-ho Lee's true identity. However, he must stand up to those who are after the ledger. Deok-su carries out a plan to punish them. Meanwhile, Jun-hwa makes a desperate decision to have Deok-su...

Deok-su deceives Cheon Bang-ju to complete his revenge and proceeds with his plan, while devising a plan to live with Lee Eun-ho. Meanwhile, Jun-hwa accepts Cheon Bang-ju's order to prevent Deok-su's choice. Soo-ra also forges her own destiny in her own way...