'Romance is a Bonus Book': What is Cha Eun-ho's promise to author Kang Byeong-jun about?
'Romance is a Bonus Book' will now concentrate on the secret that Eun-ho's keeping for his professor, the celebrated author Kang Byeong-jun
Till now, Netflix show 'Romance is a Bonus Book' had concentrated on the relationship between Cha Eun-ho (Lee Jong-suk) and Kang Dan-yi (Lee Na-young).
Celebrated author Kang Byeong-jun's arc took a back seat as Eun-ho and Dan-yi got closer. Now that the two have started to date, the series will likely move on to unravel the mystery behind Eun-ho's professor and the promise that he made to him.
In the first episode, we saw Eun-ho stop his car at a particular roadway and contemplate something that he couldn't share with anyone except his boss at the publishing company.
