Hi!
Quite difficult to answer since I can't find a drama that fits all the tropes you like with the same ambiance as in the second couple of DOTS. However, two dramas came to my mind when I was reading your post but they don't fit all your criteria:
1) Autumn's Concerto : Quite old (2009), the FL doesn't chase the ML at all, it's more like a natural process even if the ML is, at first arrogant, thinks everything turn around him etc... The FL will make him change a lot. The beginning of it is a bit cliché but you'll see very soon that this is in fact a mature story. They go through so many things together, they sacrifice sometimes themselves. I really think this can fit the trope : not worthy enough... or not good enough to protect her, love her... In this, there are a lot of basic tropes (which I will not describe it would be a major spoiler), but the ambiance of it, the authenticity, it gives a sense of reality. We will see them from their youth until their 30/35 years old I guess. I loved it, it talks about regrets, past happy days, love and so many others things
2) Love and Redemption : This might be a bit strange for you since I don't see any drama of this genre in your Completed List. This an Historical/Fantasy Chinese drama. For me, this is the most beautiful love story I've ever seen. I don't want to say anything about it, because I loved to discover everything about this. Same as fro Autumn's Concerto, here this is the ML who chases the FL but not in an obivous way. He's dying inside for her, trying all he can do without confessing her what he feels. He sacrified so many, and even when it's done he still continue to hope something. He really think he's not worthy enough... It's all about fated love, star-crossed lovers, sacrifice, pain, hope, bravery etc...