It's precisely because she has a clear understanding of these things in her mind that Yun Chu doesn't mind Rong Yan getting close.
To her, Rong Yan is just a friend she can chat with, and as for what she means to Rong Yan, well, that's Rong Yan's own business.
Whether Rong Yan likes her or wants to take their relationship further, that's all Rong Yan's business, and it has nothing to do with her.
Especially since Rong Yan hasn't explicitly said anything yet, she feels there's no need to overthink it.
If Rong Yan directly tells her he wants to be in a relationship with her, she would refuse outright. This is her being responsible to herself; she doesn't like ambiguous things or using someone as a backup. Not everyone can do such things.
Of course, since Rong Yan hasn't made any clear statement, she assumes that Rong Yan can still control his feelings for now, so she doesn't need to make any unnecessary moves.
