while junsu was talking , trying to soothe mrs . jung , he felt yoochun lean in closer and wrap an arm around his waist.his breath caught , and he nearly missed the question , " junsuyah ? do n't lie to me . who 's jaejoong ?

Question: Why did Mrs. Jung ask Junsu about Jaejoong ?
Answer: Mrs. Jung asked Junsu about Jaejoong because she does n't understand his relationshi with Yoochun .Mrs. Jung asked Junsu about Jaejoong because Jaejoong told her Junsu and Yoochun are together .Mrs. Jung asked Junsu about Jaejoong because she thinks Junsu is cheating on her .Mrs. Jung asked Junsu about Jaejoong because she thought Yoochun was Junsu 's lover .