(So I decided to start doing more simple and short imagines when I don't feel like doing much or don't have ideas for long reactions, hope you like them as well)
Kard reaction when they lose you in a crowd:
J.Seph:
He would so worried about you and would be frantically searching non stop and asking people if they saw you.
BM:
He would be worried but not that worried. He would sit and wait for you to find him because he knows you'll find him.
Somin:
She would be like J.Seph. She would be searching for you everywhere and when she found you, she would be so happy.
Jiwoo:
She would just text you asking where you are. She would start laughing once you told her you found a really cute outfit for her.