New Jeans' DANIELLE's sister is rumored to be making her debut as a singer... Will she be participating in the TV series OST?

Internet users are showing great interest in the sister of DANIELLE, a member of the girl group "NewJeans." Her sister is an artist called GYUNA.
On the 16th, online posts were posted of GYUNA singing the OST "LAVA" for the TV series "Hyde - My Husband's Secret".
The comments on a YouTube video containing the song became a hot topic. One netizen commented on the video, "Congratulations on your debut, GYUNA. You're a great artist like a little sister."
The user then asked who GYUNA's sister was, to which he replied, "DANIELLE from 'New Jeans'."
Danielle's sister is known to have worked as a child model when she was young. It has not yet been officially confirmed whether Gyuna is Danielle's sister.
In relation to this, the management office ADOR of "New Jeans" said on the same day that they were "currently checking." Leeway Music, the OST production company,
When "LAVA" was released, the company described GYUNA simply as "a promising new artist with potential."
Meanwhile, DANIELLE's group, NewJeans, will be releasing a new single and making a comeback on May 24th.
I plan to check it out.