The first season is always the best whenever it comes to dramas, because it would have the most original storyline, and suspensing. I liked Teppei’s naiveness and find it super adorable, though I hated his look -_- I think Iryu 2 still lived up to Iryu 1’s expectations! However, it gets abit “routine” once it reaches Iryu 3. It was still enjoyable, suspensing and good but yeah I would say 3 seasons for Iryu is probably the end. Overall, I enjoyed all 3 seasons of Iryu. It was really suspensing and enjoyable throughout all 3 seasons.