She previously claimed he was two-timing with her.
Recently, POLARIX member Junhyuk was accused of cheating by an ex-partner.

Across several posts on Weibo, a woman claiming to have had a relationship with Junhyuk claimed that the idol had two-timed her, in addition to relying on her financially.
In addition to private messages, she shared a photo of the two of them together that matched a now deleted image on his Instagram.
The alleged ex also made posts that seemed to be warnings towards his fans, trying to show what kind of person he allegedly is.
Oppa is so handsome. Oh no but you pissed me off.
— Alleged Ex
One post like this alleged that the idol had a secret account on Instagram, where he followed adult video actresses, or pornstars as they are also known.
He’s not worth you liking him. How can you like an idol who likes to use an alt account to follow tons of AV (Adult Video) actresses?
— Alleged Ex
You can read more about her accusations below.
Active K-Pop Idol Faces Cheating And “Gold-Digging” Accusations From Ex-Girlfriend