I started with this drama mainly because the plot seemed interesting enough. We all know what happens in a forbidden kind of love story between student and teacher and I expected it to go the cliched way right from the beginning but Biscuit Teacher surprised me here. The relationship between Tae In and Bo Ri has been depicted with sensitivity and a lot of depth-they are like friends, each other's mentors, guides, siblings, parents and lovers. Beginning was extremely fun and humorous with lotsa hilarious and heart-rendering situations involving individual students. But towards the end it kind of became a drag where there was little to no substantial plot development. It was heart-breaking to see Tae In cry so much and frustrating to see Bo Ri act like a confused teenager, unsure of her feelings. However the ending totally made up for it- very sweet. If not for anything else, this drama MUST be watched for Gong Yoo's realistic portrayal of an innocent and love-struck teenager, who matures from an eccentric, unruly kid to a real man with the strength to sacrifice what's most dear to him. Great acting by Gong Hyo Jin and the supporting cast as well.