Sure, I'd be happy to elaborate on the acting in Crash Landing on You.

Son Ye-jin and Hyun Bin's performances were simply phenomenal. Their on-screen chemistry was palpable and their nuanced portrayals of their characters' emotions and struggles were truly captivating.

Son Ye-jin's portrayal of Yoon Se-ri was particularly impressive. She effortlessly conveyed Se-ri's confident and independent persona as well as her vulnerability and inner turmoil. Her emotional range was incredible, as she seamlessly transitioned between humor, sadness, and hopelessness.

Hyun Bin, on the other hand, brought a quiet intensity to the role of Ri Jeong-hyeok. His stoic demeanor belied a deep well of emotion, which he conveyed through his expressive eyes and subtle facial expressions. He was especially powerful in the later episodes, as his character faced increasingly difficult choices and situations.

The supporting cast also delivered strong performances, with each actor bringing depth and nuance to their characters. The members of the North Korean army unit, in particular, added humor and heart to the drama, making them stand out as more than just caricatures of North Korean soldiers.

Overall, the acting in Crash Landing on You was top-notch and helped to elevate the drama to new heights. Son Ye-jin and Hyun Bin's chemistry and emotional performances were a major highlight of the drama, and the supporting cast also deserves recognition for their exceptional work.