This phone call, Shen Zuimo didn't make it to agitate Xiaofan or cause trouble for him.
It's the first time Shen Zuimo has used the unique rights of a woman to act capriciously in front of Xiaofan. Moreover, this capriciousness is threatened with her own life.
Shen Zuimo is not an immature woman; on the contrary, she is too sensible. After so many times, she already has a very deep understanding of Xiaofan. If he continues to stay in Japan, he will lose his life.
Shen Zuimo knows that no matter who tries to persuade him, once he makes up his mind, it is impossible to change it, which is why she uses such an extreme approach.
Moreover, it's a half-joking way of saying, if he really can't come back, then the antidote is useless even if taken.
