Singers Se7en and Rain showed off their unexpectedly close friendship with each other through a conversation on their Twitter accounts. On May 17th, Rain asked his fans on Twitter, "Everyone, what is the best pet to take care of indoors? I need expert knowledge on this. Something that listens to me well." In response, Se7en uploaded a picture of a dog and replied, "Get something like this! A pet dog that looks like you!" The picture Se7en uploaded was indeed a puppy with small, squinty eyes that smiled exactly like Rain. Rain tweeted back, "I think you need to go back to high school. Today's punishment day!" Se7en then replied, "Ah hyung-nim, anything but that… I'm sorry. You already hit me a lot during high school." Afterwards, Rain lightheartedly replied, "What, when? I took care of you the most, people will misunderstand." Seems like an exchange only friends would feel comfortable with, right?  Who knew? Source: TV Daily via Nate