Despite the fact that things just never seem to go his way, Sang Ha always manages to find a reason to smile. And the biggest reason of them all is his secret crush on Jin Won, a record breaking marathon runner in their high school. He started sending a box of milk everyday to Jin Won secretly after Jin Won's training and feeling happy when Jin Won finished drinking them. His crush made him follows Jin Won to the same university, but when Jin Won finds himself struggling to maintain his record-breaking stats, his coach suggests Sang Ha step in to help as a pacemaker. And of course he won't decline the offer.