"Heartbeat Signal" Why did Ma Zijia break up?

There are many reasons why Ma Zijia and Kong Ruchun broke up in Heartbeat Signal, but there is no official explanation. Some people think that Ma Zijia participated in this program for short-term selection, so it is not surprising that she broke up with Kong Ruchun. In addition, some people think that there is no strong emotional foundation between Ma Zijia and Kong Ruchun, so they finally broke up.