An offer that is as tempting as it is mysterious: you try to become a happier person for a year and at the end of the year you get a million euros just like that, no matter how it goes - how about it? Are they in? They definitely are. Firat (Eko Fresh), a fun-loving small businessman, Jasper (Manuel Rubey), an inhibited actuary, and Ines (Katharina Schüttler), a career-oriented lawyer, are in. Week after week, the three have to report to the generous initiator, Mr. Herzinger (Branko Samarovski), on their progress with happiness and how things are going: often disastrous, very funny, but above all surprising. Mr Herzinger has only two small conditions: Their partners (Karolina Lodyga, Lena Dörrie and Sergej Moya) plus children are not allowed to know about the deal, and all three have to hold out together until the end... can this turn out well and are they really happier in the end? What could go wrong?