"Gu Family Book" Lee Seung Gi and Lee Sung Jae have officially begun their personal war.

April 22, the 5th episode of the MBC drama "Gu Family Book" featured Jo Kwan Woong (Lee Sung Jae) created a ripple that will prove to be very difficult to undo.

Jo Kwan Woong tries to frame Park Moo Sol (Uhm Hyo Sup) with conspiracy in this episode as well as threatening his life as well as the life of Choi Kang Chi (Lee Seung Gi). However, Dam Yeo Wool (Bae Suzy) and Choi Kang Chi work together to reveal that Jo Kwan Woong is the one who was behind it all.

When Choi Kang Chi insults him in front of everyone revealing all of his evil intentions, Jo Kwan Woong gets furious and decides to stab Park Moo Sol. Choi Kang Chi decides that he will revenge Park Moo Sol's innocent death.

Jo Kwan Woong had killed Choi Kang Chi's parents as well as his mother Yoon Seo Hwa's (Lee Yeon Hee) father after framing him of conspiracy.

When Choi Kang Hee eventually finds out about his personal history, he will surely despise Jo Kwan Woong even more.

Meanwhile, this episode also featured General Lee Soon Shin seeking help from Park Moo Sol to build the "Geobukseon" (Turtle Ship) right before the Japanese Invasion of Korea in 1592.