Zhang Heng wasn't startled by Leah and the drummer's passionate kiss.
Based on the data Waldo collected, Zhang Heng got to know that Leah was bisexual, meaning she was attracted to both men and women. In junior high, she had a boyfriend who was the captain of the football team. He was her first love. Two months later, however, she found out that her boyfriend was cheating on her with a girl from the cheerleading team. Amid the tumultuous heartbreak, she gradually realized that she was also attracted to girls.
Following that, she had three girlfriends, the blonde drummer being the third. They got together six months ago, and from her correspondence with Gaspard, Zhang Heng could tell that she was also interested in him.
In general, most people looked better in pictures than in person.