"Hey, welcome to the Sparrow Club," says the leader of the club, as you walk in for the first time. "I'm Ryan, nice to meet you." The two of you shake hands.
As you walk around, you notice that the room has a very Chinese décor to it, and indeed most of the people here are East Asian in ethnicity. People are all sitting down at square tables in groups of four, playing board games. Some of them are playing casually, others look deep in concentration deciding what to do next.
"I'll introduce you to some of the regulars first. Here we have Pin Hu and Toi-Toi, who are teaming up against two others," says Ryan, motioning to the first table as you two walk past.
"Over there are the pros of the group," says Ryan. "They're two pairs of siblings, named Sangen and Suushi respectively. Nobody here knows their first names, because they've never told us. We've just used their last names as nicknames ever since they joined the club."
You then come across a group of two playing together instead of four. "What's with those two?" you ask Ryan.
"Oh, those are Fan Pai and Tan Yao," said Ryan. "They're the dunces of the group, they know how to play but never really got good at it."
Finally, the two of you sit down at a table with another person already at it. "You want to play with three players?" he asks. "My sister Yi couldn't make it today."
What board game are people playing here, and what is Ryan's last name?