In Beijing, onlookers watch a gathering of "I-people" With people of the same kind, they try to find their own comfortable social space. The "E" and "I" correspond to the extrovert and introvert types in the MBTI (a theoretical model of personality types) A reporter from Beijing Youth Daily, who is a type I personality, also signed up to experience an "I person" party - helping people celebrate their birthday at the Haidilao hot pot restaurant.