*This content was translated by AI.View Original

Actress Koo Hye-sun revealed the reason behind rumors that she is a heavy smoker.
On the 18th, Koo Hye-sun appeared as a guest on MBN's "Kim Ju-ha's Day & Night."
That day, Kim Ju-ha asked Koo Hye-sun, "You co-starred with a director. Did you have trouble because of cigarette scenes?"
In response, Koo Hye-sun explained, "I acted smoking in my debut feature film. But viewers said, 'That's not how you smoke.' So I practiced for about 10 months. I deliberately smoked a pack every day."
Koo Hye-sun added that she learned to smoke from her younger university peers, noting, "It was during the pandemic, so in-person meetings were difficult. That's why I learned via video chat."
She also revealed that at the time, a post titled "Koo Hye-sun, heavy smoker" appeared on a university app, saying, "I thought I had succeeded with this level of success. After that, we proceeded with filming."
<© STARNEWS. All rights reserved. No reproduction or redistribution allowed.>
*This content was translated by AI.View Original
![[Official] tvN: "No confirmed December schedule for 'Signal 2' amid Cho Jin-woong controversy"](https://image.starnewskorea.com/cdn-cgi/image/f=auto,w=300,h=208,fit=cover,g=face/21/2026/10/2026102509301562533_1.jpg)
!["An Elementary School Student Slipped Out": Big Mama's Lee Young-hyun Shows Off Her Look After Losing 33 kg [Star Issue]](https://image.starnewskorea.com/cdn-cgi/image/f=auto,w=300,h=208,fit=cover,g=face/21/2026/10/2026102509143634004_1.jpg)
!['Profanity Controversy' ALPHA DRIVE ONE's Kim Gun-woo Files Status Confirmation Lawsuit: "I Want to Return to the Team" [Star Issue]](https://image.starnewskorea.com/cdn-cgi/image/f=auto,w=300,h=208,fit=cover,g=face/21/2026/10/2026102508531010299_1.jpg)
![[Official] tvN: "No confirmed December schedule for 'Signal 2' amid Cho Jin-woong controversy"](https://image.starnewskorea.com/cdn-cgi/image/f=auto,w=640,h=427,fit=cover,g=face/21/2026/10/2026102509301562533_1.jpg)
!['Profanity Controversy' ALPHA DRIVE ONE's Kim Gun-woo Files Status Confirmation Lawsuit: "I Want to Return to the Team" [Star Issue]](https://image.starnewskorea.com/cdn-cgi/image/f=auto,w=640,h=427,fit=cover,g=face/21/2026/10/2026102508531010299_1.jpg)
![“Plenty of Controversies”: Will Park Wi Return to YouTube for Monetization? The “Six-Month Rule” Test [Star Issue]](https://image.starnewskorea.com/cdn-cgi/image/f=auto,w=640,h=427,fit=cover,g=face/21/2026/10/2026102316183126150_1.jpg)
![Song Hye-kyo, who announced a 'new beginning,' appeared affectionately while playfully interacting with Gong Yoo..Beaming smile [Star Issue]](https://image.starnewskorea.com/cdn-cgi/image/f=auto,w=640,h=427,fit=cover,g=face/21/2026/10/2026102422483491963_1.jpg)





