So Ji Sub details his friendship with fellow actor Song Seung Heon during his appearance to promote his upcoming movie "Confession."

With co-star Kim Yoon Jin, the two lead stars appeared as guests in SBS Power FM's "Choi Hwajung's Power Time" where they spoke about their experience and working relationship for the thriller crime movie.

Kim Yoo Jin Surprised at So Ji Sub's 'Self-Management'

However, the actor made the host laugh after confessing that Song Seung Heon hasn't followed him back, noting that his celebrity friend's following is still at zero.

As seen on So Ji Sub's Instagram, he shared a throwback photo of him and Song Seung Heon during their modeling days.

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Written by Geca Wills