Aqua is unfamiliar with the subtle and not quite as subtle differences between the varying levels of a relationship. Lovers, friends and strangers are how he categorizes every one. Acquaintances and allies? Friends. People he knows through others? Friends. So as far as Aqua can tell, Su-jin has a lot of friends. Which makes him appreciate all the more than he's choosing to spend time outside by the water with Aqua.

"I have noticed that!" Aqua glances up at Su-jin, smiling in return, and then follows his line of sight back toward the house. Vena. The person whose party this is and whose house this he. Someone very important to Su-jin. Aqua finds it sweet that Su-jin seems to take joy in helping him, just like he seems to take joy in helping Aqua. ...is Aqua important too? Oh wouldn't that be nice? To be important to Su-jin as well? "I've heard the word before but I don't know what it means."