In early May 2025, popular Heart Signal cast member Seo Min Jae (also known as Seo Eun Woo)—known to K-Pop fans for her troubled relationship with former WINNER member Nam Taehyun—announced via Instagram that she was pregnant with her boyfriend’s baby.

The post revealed the identity of her new boyfriend, Jung Rae Sung. Later, it was confirmed that the public announcement was actually a “callout” since the alleged father had “ghosted” Seo Min Jae.
Since then, Seo made a few more posts about Jung and eventually got sued by him. On August 8, KST, Jung’s legal representative released an official statement accusing Seo Min Jae of spreading false and defamatory claims.
In the statement, Jung’s side claimed that he had never ghosted Seo and had expressed his intention to take full legal responsibility for the child. They claimed that while Jung has been cooperating with the investigation and keeping a low profile, Seo continued posting personal details, photos, and further allegations on social media, despite the police advising her to take them down.
According to Jung’s lawyers, police have forwarded the case to prosecutors with a recommendation to indict Seo on charges of violating the Information and Communications Network Act (defaming through spreading false information), threats, unlawful confinement, and violating the Stalking Punishment Act (including the breach of a court order). The court has issued a protective order for Jung, which remains in effect.
After the statement’s release, Seo Min Jae took to her Instagram account and made some cryptic posts. In one Instagram Story, she wrote that she had never spread any false rumors about Jung.
I have never spread false information. I’ve been blocked and have no way to contact him, and I haven’t received any messages either.
— The story above
In the next one, she wrote a concerning message, apologizing to her family and meeting them again in her next life. She also added a link to an article containing Jung’s rebuttal of the accusations, calling him a “liar.”
I’m sorry, mom, dad, siblings. I’m sorry, baby. If there’s a next life, let’s meet again. I’ll make you happy then. This is so cruel. One day, it’ll all come back around.
— The story above
Seo also uploaded a comment under one of her older posts, expressing that she was in deep pain. Many netizens responded under the comment, urging her to hold on.
It hurts so much, and it’s so hard… What was done to me was so cruel and horrifying that I can’t forget it.
— The story above
Sung Rae Sung is supposedly the son of a wealthy, high-ranking executive at a major corporation, who disapproved of the relationship due to Seo Min Jae’s past drug usage. Since back in May, she had made similar posts hinting at her thoughts of extreme self-harm due to this situation, her current posts have triggered extreme public concern yet again.
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