You all need to realize that Rosa is doing everything to repress her feelings for Yeonwu ,this is the very reason she (reminder that there should be consent irl) roughs him up to shield herself from vulnerability she feels because of her feelings for him .
If the mother comes back and she gets back with Yeonwu ,Rosa will lose it from jealousy and will shield herself again by distancing herself and meeting Jae on again ,which has been stated to be there because Rosa uses sex as a coping mechanism,
You all need to realize that Rosa is doing everything to repress her feelings for Yeonwu ,this is the very reason she (reminder that there should be consent irl) roughs him up to shield herself from vulnerability she feels because of her feelings for him .
If the mother comes back and she gets back with Yeonwu ,Rosa will lose it from jealousy and will shield herself again by distancing herself and meeting Jae on again ,which has been stated to be there because Rosa uses sex as a coping mechanism,
So the foreshadowing is probably Rosa .