Chinese secret agent Da-hee receives intel that a large number of illegal firearms are being smuggled into Korea and is sent to investigate the case. She meets Su-han, who is supposed to help her with the case, but due to his lackluster skills they fight over trivial things. But as their witnesses are suddenly murdered, the two of them quickly become the prime suspects.

About a group of people who gather at a hotel, each of them for reasons of their own. Mister Yoon is the mysterious general manger of the hotel. Ho Eun is a suspicious woman who seeks out the hotel in order to perfect her writing. Lee Jung Eun is a woman who comes to the hotel for a break after finding out about her husband’s affair. She is also determined to raise her daughter as a brilliant ballerina at all costs. Seung Hoon is a man who comes to the hotel in search of a former friend who ran away with all his savings. Mi Na is Jung Eun’s daughter, who started ballet because of her mom and now hates it with her whole heart.

The wedding is perfect until the bride receives a letter claiming the groom spent the previous night with someone else. This marriage is crucial for both families' financial interests, and various personal and professional stakes are tied to it. The groom's friend grows suspicious, and the bride, a teacher on the verge of a promotion, faces immense pressure as her reputation and career are on the line. As tensions rise, the groom confesses he was unfaithful, and the bride faces a tough decision that could shatter her life.

The 2017 AOA 1st Concert [Ace of Angels] was a concert held by the South Korean girl group AOA in Seoul on March 11, 2017, at the Olympic Hall in Olympic Park. This was their first standalone concert in South Korea, taking place after the release of their first full-length album, Angel's Knock, in January 2017.