Mr. Heart
"Pacemaker for him."
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 Watch
No streaming options found for United States. Try changing your region.
Trying to watch this from United States?
Some content may not be available in your region. Use a VPN to access streaming services from anywhere.
Unlock with NordVPNAffiliate link • We may earn a commission at no extra cost to you
Seasons & Episodes
1. 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.
2. 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.
3. 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.
4. Be a Pacemaker
Sang Ha invites Jin Won on his milk delivery run to train together.
5. 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.
6. That Guy's Password
Jin Won thinks of a way to help Sang Ha with his financial troubles, while still protecting his pride.
7. 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.
8. Marathon and Love in Common
What do marathons and love have in common? They can't stop once they start.
