Rapper A-JAK lent his voice for 'Is Lovesickness Refundable?'.

'Is Lovesickness Refundable?' is a romance web drama starring AOA's Hyejeong, Ryu Eui Hyun, Joo Won Tak, and Nam Kyung.

Rapper A-JAK teamed up with Chaewon for the OST titled "Lovesickness," which officially released on April 3. Listen to the track in the clip below. 

Meanwhile, 'Is Lovesickness Refundable?' can be watched on various online platforms including Naver TV and YouTube.