So this chapter is JUST Soojin's scenes, they are in order and I will say when it happens in the MV as well as the lyrics that go over the scene

1) After Sunghoon's first line, and before the first group dance scene

Lyric: To You

In between Sunghoon's first line and the first group dance, an eye that opens shows up on the screen.

The eye isn't just a normal. It's red.

Fans found out that the eye belongs to Soojin.

2) Right after the scene showing Sunoo biting into Jungwon's neck.

The scene changes to Soojin looking through the open dood with a blank expression. She's just staring at them...

3) Right after Soojin's line during the bridge (Instead of the eye scene)

Lyrics: To You

The camera zooms out of Soojin's eye and shows her dropping a tea cup filled with a red liquid, shattering everywhere, along with a pill. A pill that looks similar to Heeseung's pill. She looks at the camera and it zooms back into her eye.

4) During the last group dance

Soojin's scene and the group dance scene switch back and forth. You can see clips of Soojin rummaging in the mess she made when she dropped the cup. She found the pill in the mess and swallowed it.

5) Related to the last scene

Now this new scene of Soojin writhing in pain on the floor is flashing during the group scene.