Lu Heng is the least promising frontcourt player in the provincial youth training men's doubles group. He doesn't kill the ball hard or grab the net aggressively, and his position is always criticized as "like fortune telling." Until a team test, he suddenly saw the probability of the ball path, and also saw the "unreturnable position" every time the opponent moved. Everyone said that men's doubles is not a math problem, and partner Chen Lie also thought he was holding him back. But when Lu Heng started to hit the judgment line with one shot, forcing his opponent into a certain death space, Chen Lie's heavy artillery finally had a real landing point. From the bottom of the team to the semi-finals of the National Invitational Tournament, this temporary combination that was ridiculed began to make everyone understand: badminton is not a metaphysics, but every step has a price.