What do marathons and love have in common?  They can't stop once they start.

Sangha's lenders pressure him into a challenging feat of finishing the marathon in order to repay his debt. 

Jinwon thinks of a way to help Sangha with his financial troubles, while still protecting his pride.  

Coach Bong takes the training team on an excursion to prepare for their competition.  Songha receives a threat from those who he owes money to.  

Songha invites Jinwon on his milk delivery run to train together.  

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. 

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.  

Jin Won is insulted when his coach assigns him a freshmen student to be his pacemaker during training and his upcoming marathon.  However, after testing Sang Ha, Jin Won sees his skill and potential.