I'll keep this review simple. Happy Birthday the series is one of the best series you'll ever see. It will teach you how suicide affects not only the victim but most especially those who were left by the person who decided to do the act. It gives the sensitive issue of suicide different angles on why people do it, the pressure from society, how much important support is, and how forgiveness is hard to do but is essential in growth. Just like the main lead's name suggest (Tonmai in Thai means tree), you will see each character's development as the story goes. The addition of 'a ghost sibling' makes it easier for people to comprehend why such actuons were made. Also kudos to the actors because you can feel every bit of pain from each tear drop they shed and how sincere their happy moments were.