Lovely Runner

Its similar as the male lead is in the entertainment industry. Male and female lead went to the same school, grew up in the same neighbourhood. The height difference. The difference is that uncontrollably fond is melo, sad and tragic , lovely runner is cute and time travelling but also sad and some type of tragic.

They are similar in the fact that they are time travel dramas that utilize a watch as the trigger for time travel. Many more similarities but watching "The Light in Your Eyes" is the key to figuring that out.