Happy New Year depicts the story of people who visit Hotel Mross with their own stories creating relationships in their own ways.
Han Ji-min plays the role of a hotel manager on the ball who has been hesitant to confess to her boyfriend for 15 years.
Lee Dong-wook transforms into a young and capable representative of Hotel Mross, who has even number obsessive compulsive disorder, and
Kang Ha-neul visits Hotel Mross as a job seeker whose girlfriend leaves him after failing the civil service exam for the fifth year.
Yoona is a hotelier for Hotel Mross, and
Won Jin-ah plays a musical actress who works as a hotel room maid.
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