20 years ago, a promise was made. What type of adults have they become? Did they become who they wanted to be? In 1997, they faced a huge enemy that only young courage could fight against as a weapon; in 2017 they are faced with even more formidable opponents.

Sequel to Kingdom (2019).

Akiko (Atsuko Maeda) travels to Vladivostok to meet Matsunaga (Ryohei Suzuki), who she first met in Tokyo and is unable to forget. Even though Akiko meets Matsunaga again, Matsunaga does not remember her. Matsunaga tells her to not trust anyone in the foreign country and he leaves. Akiko tries to find Matsunaga again, but she is attacked by the mafia and thrown out in the wasteland without any money.

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A woman gets engaged with her current boyfriend, when suddenly she starts receiving messages from a mysterious and secretive man. With help from her brother who is a policeman, she finds connections between the mysterious man, her teenage love, and an old classmate who died in a fire. Little by little, she finds out the dark truths of the man she loves and the man she loved.

Reiji Kikukawa (Toma Ikuta), who has a strong sense of justice, graduated from the police academy with the lowest score ever. He becomes a police constable, but is suddenly fired by the Police Chief due to "disciplinary" issues. In actuality, the firing is part of a carefully orchestrated plan. Reiji is ordered to become a "mole," an undercover cop. His target is Shuho Todoroki, the boss of the Sukiyakai gang. The group is the largest crime group in the Kanto area. Masaya Hiura, who works as a young boss of a Sukiyakai affiliated gang likes Reiji. While going through various hardships, Reiji works his way towards Shuho Todoroki.

Li Jeng-je and Hue Wei Luen are bestfriends. Before they realize, they fall in love with each other and change their relationship from best friends to lovers. But Je is a basketball player who is afraid that his sexual orientation...

A man (Hyun-Bin) suffers from mental illness after having lived with a mother suffering from dementia and a brother addicted to gambling. Now institutionalized, he falls in love with a nurse (Lee Bo-Young) at the psychiatric hospital.