First, if Keiko's career has been tepid, then her relationship with Yiming Zhou will be very stable, and it is not impossible to get married and have children.
Keiko is a member of the women's group in the play. Although the team is famous, she is not famous personally and has no fan support, so until the end of the plot, her career has not improved. If this continues, she will marry Yiming Zhou and even have children in less than two years, and then she can spend the rest of her life smoothly. But if her career improves, it will be another ending. It is unrealistic for people in film and television circles to get married prematurely, and after entering the wider world, no one can predict whether she will change this after meeting someone better, so their outcome depends on Keiko's career decision.
Secondly, Keiko may not be the best choice for Yiming Zhou, but it is one of the reasons for him to start a new life, which is beyond doubt.
Personally, I don't think Keiko is suitable for Yiming Zhou, because she is too young. Although everyone loves each other very much, it is not enough to have love in real life, but also to understand and tolerate. When she is no longer the boss of an investment company, when she is no longer so rich, and when Yi Lao needs comfort from others, she is obviously not a suitable candidate, because she is too young to know how to do it at all. For Yiming Zhou, her later life will be more tiring.
Finally:
In fact, I really hope that Zhou's ending is to get married. Although it is not revealed in the film and television drama, Yiming Zhou is going to get married in the end, so as long as the other party agrees, the end of love is marriage.