P1Harmony's Theo is the voice behind "Half of My Heart" for 'The Matchmakers' OST.

In the music video above, Confucian scholar Shim Jung Woo (played by Rowoon) finds himself falling for matchmaker Jung Soon Deok (Choi Yi Hyun). "Half of My Heart" is a sweet, upbeat love song about finding someone who completes your half. 

Check out Theo's "Half of My Heart" above, and let us know what you think in the comments below. Have you been watching 'The Matchmakers'?