Mr. Heart

Despite his misfortunes, Sang Ha always manages to smile. A sprinter on his school track team, he finds joy in short-distance races. Jin Won, a marathoner with record-breaking stats, is focused solely on his next race. When Jin Won struggles to maintain his performance, his coach pairs him with Sang Ha as a pacemaker. Initially resistant, Jin Won warms to Sang Ha as they discover a shared passion for running. As their bond deepens, they realize their feelings for each other may complicate everything they've worked for.

Synopsis: MyDramaList