Masquerade Hotel

Both movies involved the stories of hotel guests as well as the employees. The guests and employees somehow interact, form relationship, plot, help and bond

Both are Japanese involved in a hotel. Both has the same male and female leads. Both has some murder mystery

Heir Goo Won, known for his brilliance and charm, despises fake smiles but is captivated by Cheon Sa Rang’s genuine one. As they bond over their shared desire for true happiness, Goo Won is thrown into an inheritance battle at King of the Land, an exclusive lounge owned by The King Group.

Cheon Sa Rang, with her radiant smile, lands a job at King Hotel, a place full of childhood memories. However, she must set those memories aside and quickly adapt to the challenges and prejudices she faces at work.

both are novel adaptations, both involve people dying, both mystery, both pretty good. although they differ in different areas, they do share some similarities so yeah