Actress Cha Hwa Yeon confused by heart text message from 2AM's Seulong?

Actress Cha Hwa Yeon revealed her confusion about a text from 2AM's Seulong.

'Strong Heart' MC Shin Dong Yup opened the conversation by saying, "I heard you and Seulong call each other often." Cha Hwa Yeon replied, "Lately, I haven't been talking to Seulong. I was surprised because he suddenly sent me a text message with a heart. I thought about what it could mean for 2-3 days."

What do you think about Seulong's text?