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He will be returning to promotions after 6 months through a play, titled 'Miracles of the Namiya General Store', from February 10-11. In an official statement, Choi Sung Won addressed fans with:

"Due to personal reasons, I was unable to greet you all for a very long time. I am very thankful toward everyone who trusted in me and waited for me, as well as those who encouraged me. 

I also thank you for your love and attention toward No Eul from 'Reply 1988' last year. While I had taken a step forward in order to repay that with better acting and more effort, I was diagnosed with acute leukemia, very suddenly. After 6 months, I am now able to spend precious, thankful days, where I can once again dream of the road to an actor. 

Currently, I have a role in a play in February called 'Miracles of the Namiya General Store'. Because it is a play where we read out the script, rather than a formal play consisting of a lot bodily movement, I am enjoying practice without overexertion. 'Miracles of the Namiya General Store' was the first book of many books that I received as gifts when I first began treatment. Director Park So Young, a close comrade, suggested the play to me and I was able to participate in it with gratitude. 

I am careful about my future plans, despite your curiosity. I am also looking forward to the day that I can greet you with a better production, when I am healthier. I may be able to greet you better in the coming spring, or maybe a little later in the summer, so please maintain your health throughout the cold winter."