Chaeyoung is The Ocean Monkey

This is the day pillar only. It is fixed by the calendar date of birth, which is public — so it can be calculated with confidence. The hour pillar cannot: Chaeyoung's birth time is not published, and guessing at one would produce a chart that looks precise and is not.

What the day pillar says is character rather than circumstance.

The day pillar is read as two halves. The stem is what a person is made of; the branch is what they are standing on. Here the stem is yang Water — water with depth — wide, slow, holding far more than it shows, and unreadable from the surface by design.

The branch is the Monkey: inventive ground — a footing that finds the third option, and can mistake cleverness for a decision.

Both halves push outward, which makes this a chart with very little brake on it. The strength is that nothing has to be talked into starting. The cost is that there is nobody inside the chart arguing for waiting.