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Episodes: 30

Duration: 45 min.

Aired On: Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday

In 1988, Duk-Sun (Hyeri), Jung-Hwan (Ryoo Joon-Yeol), Sun-Woo (Ko Gyung-Pyo) and Dong-Ryong (Lee Dong-Hwi) are high school students and Taek (Park Bo-Gum) is a go player. These five people have been friends since they were little kids. They all grew up together and are neighbors to this day. Their families are also very close to each other. They always hang around Taek's room and spend time together.

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Criminologist Himura Hideo seeks the pleasure of murder scenes and announces “I’ve ever wanted to kill a person”. He appears to be a rather dangerous guy who pursues the ultimate crime. His buddy is the somewhat unreliable mystery novel writer Arisugawa Arisu who observes his investigations. His inferences keep missing the mark at times, but he regards himself as Himura’s protector. An unlikely pair for investigation scenes, the two of them make up for each other’s deficiencies as they figure out the complicated and mysterious “tricks” left behind by criminals, with exquisite logic.

With a freewheeling personality, Yoon Tae O is a 20-year-old freshman in college. He has been friends with Han Song Yi since they were little. Now, he begins to have feelings for the girl who has a bright and positive personality. Meanwhile, Tae O has a friend, Seo Ji An, who is well-behaved and exemplary. A love triangle brews between these three people.

On December 25, it is Shuko Yoshioka's (Kazue Fukiishi) 34th birthday. She has a good time with her husband Kenichi (Munetaka Aoki), her first child Ai (Konomi Watanabe) and her second child Yu (Hinata Igarashi), but Kenichi notices something different about Shuko. He asks her if something is wrong. She tells him that she might have breast cancer. She also says that she already received a test, but is waiting for the results. Shuko goes to the hospital to find out the results of her test. She hears from the doctor that she has terminal breast cancer and surgery is not an option. That night, her husband tries to comfort her. Meanwhile, Kenichi receives the results of a check-up he received a couple of days ago. He notices that it says "needs reexamination." Kenichi goes in for a reexamination and is diagnosed with lung cancer. Like his wife, he is told surgery is not an option. Kenichi, attempting to protect Shuko, does not tell anyone about his test results.

An arrogant young lady who turned from a rich man to a lonely middle-aged homeless person restarts her life from high school for a happy old age.

Adapted from the manga series "JK kara Yarinaosu Silver Plan" (JKからやり直すシルバープラン) written by Lim Dall Young (임달영) and illustrated by Lee Hye Sung (이혜성).

Dojima Otaro works as a popular host. Because of a past incident, he believes that love makes people unhappy. He now only pursues money and power.

A mysterious woman appears in front of Dojima Otaro. The mysterious woman has a pale face with red lips. She kisses him and he dies, but the next moment he regains consciousness. He realizes he is now 7 days in the past. The mysterious woman alsofollows him. Due to her kiss, Dojima Otaro dies and goes back to the past over and over again.