Ji Chang Wook decided to study because of Ha Ji Won's words.
In the 28th episode of MBC Monday/Tuesday drama "Empress Ki" (Script Jang Young Chul, Jung Kyung Soon, director Han Hee, Lee Sung Joon) broadcast on February 4th, Ta Whan (played Ji Chang Wook) studied because of Ki Seung Nyang (played by Ha Ji Won).
On this day, Ta Whan finds out that Ki Seung Nyang is wrapped up in a strategy of Tanasili (played by Baek Jin Hee) and is trapped In a study writing 100 books and headed to the study.
Ta Whan sees Ki Seung Nyang who is about to pass out and says, "What can I do to help?" Ki Seung Nyang said, "What can you do? Are you going to read all this instead of me or will you write this? Will you be able to defeat all those people outside?" and hit him where it hurt most.
Ta Whan was studying with Ki Seung Nyang and fought with her after getting scared by the pressures of Yeon Chul (played by Jun Gook Hwan). Ki Seung Nyang wanted to move Ta Whan and said a lot of harsh words.
Ta Whan was leaving the study and going back to his chambers when he said to Gol Ta (played by Jo Jae Yoon), "I think i was wrong to leave everything because of Seung Nyang. I will study again starting today" showing a different side. He then hears through Gol Ta that Ki Seung Nyang made It back safely and breathed a sigh of relief saying, "Don't tell Seung Nyang that I'm studying. I want to show. That I can do this" as he showed determination.