That Guy's Password
Jin Won is insulted when his coach assigns him a freshman student to be his pacemaker during training and his upcoming marathon. However, after testing Sang Ha, Jin Won sees his skill and potential.
Series
Mr. Heart
미스터 하트
“Pacemaker for him.”
2020EndedSouth Korea15 min
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What's it about?
Jin-won cares about one thing only: running. When he finds himself in a slump, his coach suggests Sang-ha as a pacemaker. Though Sang-ha's efforts are initially ignored, they find themselves growing closer and closer over time.
Where to stream?
Rakuten Viki
Checked 08/22/2026 · last check was a while ago · United States catalog · account required.
Available (check outdated)
Availability data partly provided by JustWatch via TMDB.
Cast
Cheon Seung-ho
Jin-won
8 episodes
Han Se-jin
이세진
Sang-ha
8 episodes
Lara
문신애
Hyo-ri
8 episodes
Yoo Jang-young
유장영
Coach Bong
8 episodes
Park Geon-Rak
박건락
Loan Shark Firm Boss
8 episodes
Jang Eui-soo
장의수
University track team member
1 episode
Yeo Woon-bok
여운복
Jin Won's father
1 episode
7 people — scroll sideways
Crew
Director
Park Sun-jae
Episodes
Season 1 — 8 episodes · from 09/18/2020
Page 1 of 1 · Episodes 1–8
The Day the Crazy Guy Entered My Heart
After accidentally falling asleep next to Sang Ha, Jin Won sleeps more soundly than he has in years, preparing him well for the next day's marathon. After the race, Jin Won is surprised to see that Sang Ha didn't join the rest of the athletes at the celebration party.
2 guest appearances
Jang Eui-soo (University track team member), Yeo Woon-bok (Jin Won's father)
Password Secret
Jin Won questions Sang Ha about why his passcode to his door is the same as his passcode. Sang Ha reveals that he went to high school with Jin Won.
Be a Pacemaker
Sang Ha invites Jin Won on his milk delivery run to train together.
Exercise, not a date? Date, not an exercise?
Coach Bong takes the training team on an excursion to prepare for their competition. Sang Ha receives a threat from those whom he owes money to.
That Guy's Password
Jin Won thinks of a way to help Sang Ha with his financial troubles, while still protecting his pride.
Jinwon VS Up and Down, Who is the Winner?
Sang Ha's lenders pressure him into a challenging feat of finishing the marathon in order to repay his debt.
Marathon and Love in Common
What do marathons and love have in common? They can't stop once they start.
Image gallery
Posters (13)
Stills (11)
Images © their respective rights holders · Source: TMDB