Hoverlab, a South Korean news commentary site on YouTube, claimed that the actor and the late actress Kim Sae-ron had been in a six-year relationship since she was 15 years old.

According to the actor's agency's statement, Kim Sae-ron was 19 at the start of the relationship and Kim Soo-hyun was 31.

Kim Soo Hyun's agency issued a statement on Mar. 14 confirming that the Korean actor had indeed been in a relationship with late actress Kim Sae Ron. But it denied that she had been a minor at the time.