Tharntype is the prequel of 7 Years Of Love so it's highly recommend to watch that first. Otherwise, you may not know the plot and how Tharn & Type ended up together. Also their actions might seem weird if you watch the second season first
Type and Tharn have been together for seven years and both are enjoying their mostly harmonious life. They do still bicker and meet up with university friends. Now both working adults, Type and Tharn face difficult issues, as they learn that life isn't always just flowers and candies. Can they overcome their challenges or will they be defeated by them?