"Big Man" Kang Ji Whan became Jung So Min's real brother.
On the 2nd episode of KBS Monday/Tuesday drama "Big Man" broadcast on April 29th, Kim Ji Hyuk (played by Kang Ji Whan) became Kang Ji Whan and went to Kang Sung Wook (played by Um HyoSup) who said he was his birth father and ended up meeting again with Kang Jin Ah (played by Jung So Min).
Beofre this, the two people had met each other as designated driver and client. At this, Jin Ah also recognized Ji Hyuk at once.
However, Jin Ah's first impression of Ji Hyuk wasn't that great. Ji Hyuk who was searched for by the police had kissed her surprisingly. Because of this, Jin Ah had misunderstood Ji Hyuk to be a pervert.
Because of this, as soon as Jin Ah saw Ji Hyuk said, "It's that garbage, right? Do you know how much I suffered because of you? I'll sue you for sexual harassment" and was upset.
At this time, Kang Sung Wook appeared. He wanted to settle the noisy situation and said to Jin AH, "That kid is Kang Ji Hyuk. Your older brother" he explained. Jin Ah was startled at this situation that she didn't expect and asked, "This garbage?"
Meanwhile, on this day, Kang Sung Wook wanted to settle his family registry as Kim Ji Hyuk miraculously woke up from a mental coma but journalists had already caught hint of this and acknowledged him as his son.
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Source: http://www.kdramastars.com/articles/20840/20140430/big-man-jung-so-min-startled-at-news-of-real-brother.htm