Kim Jae Hwan strummed his guitar for the April 27th Japan special of 'Immortal Song'.

For the 400th episode of the show, the former Wanna One member covered Shin Seung Hoon's 2001 hit ballad "I Believe" for the 'My Sassy Girl' OST. Kim Jae Hwan expressed, "To be honest, I was so nervous. Since it's the time for me to stand on stage solo after group activities, I'm thinking a lot, and my mind is confused. I feel good because I sang without regrets today."

In the end, Kim Jae Hwan took the final trophy for the Japan special with 741 points. Check out Kim Jae Hwan's acoustic cover of "I Believe" and the original below!