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On Christmas Eve, at the luxurious Tower Sky twin tower building in central Seoul, residents and staff members busy themselves with Christmas preparation. A small fire in the restaurant kitchen attracts the attention of Tower Sky staff member Lee Dae-Ho (Kim Sang Kyung), who notices a faulty water sprinkler system. Building owner Jo (Cha In-Pyo) disregards the warning and goes ahead with the evening's Christmas party. Helicopters are hired to circle the building and spray the building with man made snow during the Christmas party. Residents gathered for the event are amazed by the spectacle. Their amazement soon turns into terror when a helicopter loses control and crashes into the building, setting off a chain off horrifying events that threatens the lives of all the residents.

Hitsujido Honpo, an established Japanese-style sweets company known for its traditional flavours and reliability, has maintained a modest popularity. To win a new segment of customers, it has embarked on new business development. The leader of this team of five young employees is 28-year old Kudo Mayuko (Takahata Mitsuki). Mayuko was headhunted by the current CEO Okazaki Kengo (Maruyama Tomomi), for her achievements in her previous job. However, she struggles with the difficulty of new business development and pressures within the company. One day, a “new” 68-year-old employee Niimoto Kazuo (Kusakari Masao) is assigned to be Mayuko’s subordinate all of a sudden. She is dumbfounded to learn that he is 40 years her senior and even feels anger. Mayuko is confronted with the question of whether he should do the old job he was proud of? Or a new job as a brand new employee, and assumes the role of mentor.

18 years later, Tu'an's favorite son, Tu'an Wujiang grew up. The young man, who was adept in both pen and sword, was a rising political star. But rumor said that he was not Tu'an gu's biological son. Cheng Daye, was involved in this mystery too. As the puzzle was cleared step by step, the truth that Tu'an had killed the Zhaos came into fight, it turned out Chang Daye was Zhao Wu, the orphan of Zhao. Cheng Ying who had kept the secret for life despite of others’ misunderstanding finally won victory and let the justice be served. During the Spring and Autumn period, Tu An Gu, the highest ranking military officer of the kingdom of Jin, orchestrated a coup d'état and framed general Zhao Shuo for its instigation, resulting in the extermination of the entire Zhao clan. There was one survivor, however - the infant son of Zhao Shuo and Zhuang Ji, whose life was saved by the physician Cheng Ying at tremendous personal risk. Cheng Ying then cleverly planned for the child to stay at the home of Tu An Gu. Eighteen years later, Tu An Gu's pride and joy is his son Tu Yue, a rising star skilled with both pen and sword. However, rumors spread that Tu Yue is not Tu An Gu's biological son, and even Cheng Ying's son Cheng Da Ye, Tu An Gu's godson and Tu Yue's study buddy, becomes embroiled in the mystery of the identity of the Zhao family orphan. In the end, Tu An Gu's role in the the bloody case of the Zhao family's extermination becomes abundantly clear, and Cheng Ying, a seemingly insignificant and spurned figure for most of his life, finally garners victory and restores justice.

For the past five years, Lin has been looking after the son, Yo Yu, and the elderly mother, Mrs. Chou, of his deceased boyfriend, Li Wei. They live together like a family, and it is Lin's way of remembering Li Wei - by continuing to be in the life he once had and loving the people he once loved. But when Mrs. Chou passes away, her other son, Li Gang, returns from overseas and discovers that Mrs. Chou's property is passed on to Yo Yu, who has been legally adopted by Lin. Li Gang contacts the police, accusing Lin of killing his mother. As the ensuing investigation continues, more and more evidence mounts against Lin.