On the episode of 'We Got Married' that aired on the 7th, LeeTeuk's ID picture was revealed. 

While shopping for furniture, Kang SoRa saw the ID in LeeTeuk's wallet and asked if she can see it. 

LeeTeuk's ID picture showed him 6 years ago. In the picture his eyes were opened widely and his hair tucked behind his ear. His picture showed him looking young and adorable.