5) He still needs to do National Service
The nature of the South Korean military means that at some point, Son will have to serve around two years National Service. The £15m required would surely be a hefty amount to spend on someone that could potentially be away from the game for nearly two years. And upon his return – should he decide to go during his career – there is no guarantee that he shall be able to rediscover the form that interested us in the first place.