It's one of the best kdrama i have ever watched , i never give rating to any kdrama but this one best kdrama i have ever watched , well I think the rating are low because they have been manipulated by some fandom who haven't even watched the drama because of the mbc mistakes , otherwise this have alot more things you can get educated about and relate yourself , it's a drama about a team which stop people from doing su*cide (su*cide prevention)