第 1 季 共 16 集
播出时间：2021年2月18日
第 1 集 Episode 1
播出时间：2021年2月18日
Aboard a falling plane as the clock ticks toward doom, Han Tae-sul puts his famous mind to work for a solution. Gang Seo-hae arrives in the year 2020.
第 2 集 Episode 2
播出时间：2021年2月19日
The contents of a mysterious suitcase give Tae-sul more questions than answers. In exchange for lottery numbers, Sun agrees to help Seo-hae.
第 3 集 Episode 3
播出时间：2021年2月25日
Tae-sul's presentation at a conference gets a violent interruption. He and Seo-hae make a narrow escape, but more trouble soon follows.
第 4 集 Episode 4
播出时间：2021年2月26日
On the run from the enforcement agency, Tae-sul and Seo-hae give in to the time traveler's request that they make a stop at his mother's house.
第 5 集 Episode 5
播出时间：2021年3月4日
Caught by Kim Seo-jin trespassing in her clinic, Tae-sul tries to explain what's going on. Seo-hae reveals disturbing details about the future.
第 6 集 Episode 6
播出时间：2021年3月5日
Seo-hae infiltrates Eddy Kim's party with a mission. After a series of distressing events, Tae-sul realizes he cannot trust everyone around him.
第 7 集 Episode 7
播出时间：2021年3月11日
Seo-hae urges Sun to flee the country, and asks Mr. Park to do her a favor in exchange for an item he's eager to get his hands on.
第 8 集 Episode 8
播出时间：2021年3月12日
Despite Seo-hae's insistence that he lie low, Tae-sul focuses on tracking down an enigmatic figure who seems to be tied to everything.
第 9 集 Episode 9
播出时间：2021年3月18日
At the amusement park with Tae-sul for her birthday, Seo-hae encounters someone unexpected. A familiar threat strikes again.
第 10 集 Episode 10
播出时间：2021年3月19日
Tae-sul enters enemy quarters to retrieve Seo-hae. Learning she's been put in a dire condition, he turns to a grudging Mr. Park for assistance.
第 11 集 Episode 11
播出时间：2021年3月25日
Tae-sul and Sigma come face-to-face. In order to rescue Seo-hae, Tae-sul must endure an emotional trip through his past.
第 12 集 Episode 12
播出时间：2021年3月26日
When Seo-hae wakes up, a person she missed is waiting to meet her. A long-forgotten childhood memory returns to Tae-sul.
第 13 集 Episode 13
播出时间：2021年4月1日
Tae-sul is reunited with a trusty friend, who comes to him with a warning. A suitcase containing disturbing contents arrives at Asia Mart.
第 14 集 Episode 14
播出时间：2021年4月2日
With the war looming on the horizon, everyone must make their choices. When Seo-hae heads to the only place she knows, Tae-sul finds her.
第 15 集 Episode 15
播出时间：2021年4月8日
As Tae-sul tries to locate him, Sigma reveals more details about himself. Sun frees Seo-hae from the bunker.
第 16 集 Episode 16
播出时间：2021年4月9日
Tae-sul asks Seo-hae to trust him no matter what happens — and demonstrates that nothing is fixed when it comes to matters of the future.
