Regret - noun.

- A sense of loss and longing for someone or something gone.

- A feeling of disappointment or distress about something that one wishes could be different.

Kim Jongin and Jung Sohee are bestfriends.

They both had their first love.

She fall in love with him.

He took it the wrong way and ignored it.

She got a boyfriend.

Then, he confessed.

What will happen to these two?

Will it be a happy ending or another heartbreak?