When Taemin broke up with Krystal, Krystal became hopeless, weak, etc. When Taemin tell to the other member of SHINee,  Jonghyun contacted Krystal.. After that.. They become more close... Krystal is a little bit afraid because Jonghyun is her sister's namja.. While Jessica is at Japan.. Jonghyun and Krystal became more close (mean.. they look like a couple