Doesn't she realize the value of the Red Love?
When Su Ziceng took off the Red Love and returned it to him, Pello thought that it was because she didn't know the true worth of "Mussen's Blessing," inclusive of the Red Love, that she would return it so casually. The Olsen family rebought Mussen's Blessing to show off their status. Pello collected Mussen's Blessing to fulfill his father's long-cherished wish.
Recovering the Red Love without effort should have been a joyful thing, but Pello felt not a hint of happiness. Su Ziceng's previous resistance, as well as her current act of returning the Red Love, both conveyed the same message: she was rejecting him, rejecting his love. Does she not realize why the Red Love was in her hands?