2017
Yoo Hyun-Jae is a member of a popular idol group. He has a lot of fans and he is a scandal maker. Meanwhile, Lee Ji-Hoon is an aspiring singer. He pretends to be studying for his civil servant exam, but he is actually struggling to become an idol.
2018
Naoko Kishikawa is a 31 year-old single who works for the undergarment section at a departmental store. She lives with her parents and a younger sister. One day, she meets a Korean photographer, Lee Ji-won. Ji-won's presence gradually changes Naoko and her family.
Mitsu marries a sensible man and hopes it makes her happy. But when her first love reconnects with her by fate, old feelings complicate everything.
Moo Goong Hwa is a former boxer. After the death of her husband, she has raised her daughter alone. She now works as a police officer. Meanwhile, Cha Tae Jin is an elite police officer who graduated from the police university. He is full of justice.
When a nerd finds a dark technology that allows him to get the perfect robot girlfriend, he accidentally also orders her boyfriend and gets caught in the middle of a very awkward love triangle.
Chi Yun is a skilled martial artist who grew up in the wilderness. He falls in love with Mu Qingmo at first sight, and openly pursues her once they meet again a couple of years later. She eventually reciprocates his affections, even though her brother had already promised her hand in marriage to the powerful noble Lingyun Shenglun. Shenglun is aware their marriage is only for alliance purposes, and promises to keep their relationship platonic. However, he eventually becomes attracted to the heroine, and is determined to keep her by his side forever.
A young man living alone in Italy faces the mysterious arrival of a woman who claims to be his time-traveling wife from the future.
In a futuristic society, Japan has implemented a complex system referred to as "The Red Threads of Science" to encourage successful marriages and combat increasingly low birthrates. Based on a compatibility calculation, young people at the age of 16 are assigned marriage partners by the government, with severe repercussions awaiting those who disobey the arrangement. For Yukari Nejima, a teen that considers himself average in every way, this system might be his best shot at living a fulfilling life. However, spurred by his infatuation for his classmate and long-time crush, Misaki Takasaki, Yukari defies the system and confesses his love. After some initial reluctance, Misaki reciprocates his feelings in a moment of passion. Unfortunately, before the two can further their relationship, Yukari receives his marriage notice. He is then thrown into a confusing web of love and lies when his less-than-thrilled assigned partner, Ririna Sanada, becomes fascinated with his illicit romance.
