Most BL stories don't try to accomplish too much during their time on screen. Usually, there is a guy who likes another guy, but one has a girlfriend or he can't accept falling for a guy, but eventually he does, and then the show ends. Until We Meet Again is unique in how ambitious the storytelling is. The story itself spans generations, requires a lot of committed actors, and demands a lot of us as the audience. For all those things, this series will go down as one of the best BL series of all time. Some shows are great for the actors(Mew/Gulf), others might be great for the characters even if the story isn't that good (Korn/Knock) but this show has a wonderful and supremely romantic storyline. I don't think it is possible to surpass its story in terms of romance, whether gay or straight. That is what makes it great.
I truly admire the work done in this series and Wabi Sabi Studios is really showing they know how to make winning shows. The director truly knows what he is doing now, and so we are in for many years of enjoyment as series made by him get better and better. Until We Meet Again will be hard to top though. When watching this, sit back, relax, cry when you feel like it (that was often for me) and just let it in.