Actor Lee Jong Suk celebrated his birthday on September 14. The model-turned-actor continues to grow in popularity, with his recent role in "Pinocchio," drawing increased attention from Hallyu fans.

His appeal to Korean drama audiences is due to numerous factors, including his charismatic personality and his ability to stir viewers through his crying scenes.

He continues to demonstrate strong acting skills since his 2010 debut in "Prosecutor Princess." From his appearance in "Secret Garden" to "School 2013" to "I Can Hear Your Voice," he continues to develop timeless K-Drama characters.

Here are four other reasons why fans love Lee Jong Suk.

1. Lee Jong Suk has an adorable social media presence.

Whether it is through his Instagram posts or videos on Naver's V app, Lee Jong Suk continues to maintain an adorable social media presence.

2. His heart-warming, K-Drama roles.

As Park Soo Ha in "I Can Hear Your Voice," he raised the bar for actors in "noona" romance dramas or series where older women fall in love with younger men. In "Pinocchio," he delivered one of his most believable performances as the on-screen lover of Park Shin Hye. Year after year, his ability to deliver heart-warming character keeps getting better.

3. He's the ultimate guy-next-door.

His ability to charismatic presence from modeling makes him an appealing guy-next-door.

4. His commitment to charity.

Through charitable efforts like the Good Library Project and his work with the Save the Children Korea campaign, he continues to prove that he has a beautiful heart.

What are your favorite aspects of Lee Jong Suk? Which K-Drama or film role is your favorite?

About the writer: Adrienne Stanley is a contributing editor for KDramaStars. She is also a contributing writer for KpopStarz, MTV Iggy, Viki and CJ Entertainment's KCON blog. Her passions include a love of K-pop and Asian drama. When she is not writing, she is hanging out on Twitter (@retrogirladdy).