Both male leads have a very mature way of handling the chaos around them. Essentially, they are walking green flags. And trust me when I say - there is chaos, and they are the lighthouse in the storm guiding those that they love to a place of safety and comfort.

The main difference would be that in Love All Play, the whole cast are a part of the sports-world (badminton), whereas in run on, only half are (track and film).

If you're looking for something relatively light hearted, I would recommend either drama. Admittedly, I did shed a few tears here and there, but I'm just a softy.

In both cases, the main leads are connected by the death of someone they care about. In Chocolate, there is a decent amount of push back from the male lead as he struggles to get over the death and accept his feelings for the female lead. Despite that, like in A Piece of Your Mind, he is drawn to the female lead - he seeks her out constantly (whether he realizes it or not), and looks for her when she isn't around.

Chocolate, is however, with an older couple. Probably around a decade older than that in A Piece of Your Mind. There is also significantly more conflict in the show as it is a full 16 episodes. The conflict the male lead has is similar in both (a good throttling solves the issue in both cases (followed by consolidation of course)).

Fair Warning: If You decide to give Chocolate a try, have a box of tissue ready. Though the romance is progressive, there are single-episode stories since it takes place in a Hospice ward (a place where people go before they die). Some of these stories will break you into a million pieces.

Both dramas have a healing theme. The main leads lean on each other for support, and develop their relationship from shared pain. In both cases, a tragedy brings the leads together; it's more immediate in A Piece of Your Mind, whereas in Just Between Lovers they reconnect years later.

Neither drama has a love triangle, which is an added bonus. The romance element is incredibly fulfilling. The longing glances, the words not said but understood, the passing touches.... It's incredibly heart fluttering.

Both stories deal with past trauma that continues to affect the main characters in their present stories.

Where with 'When My Love Blooms' it is about the choices people make and how those choices effect others, 'Just Between Lovers' deals with the unexpected, and how we move on from disaster, pain, and suffering.

Both dramas are slow, but they both offer a glimpse into how people deal with pain. Each episode is well thought out, and soul deep.

Relationships are falling apart, and being rebuilt in both dramas.
In One Spring Night, the female protagonist is stuck is a situation where not only her ex won't leave her alone, but her family is very much against the idea of her new relationship (single dad).
Both dramas are like a tug of war for relationships, and both build this slow burn of emotion that can be enraging, and satisfying.

Despite not knowing how this drama ends yet (Feb 2nd 2020), it reminds me a lot of Healer and the way the relationships formed there.
With both shows, you are on the edge of your seat waiting desperately to find out what is going to happen. Healer involves more flashbacks, and they are needed for the sake understanding the plot, so if you don't like flashbacks, maybe not for you - but I would give it a shot just to experience the chemistry between two amazing actors.
The emotional experience is also similar - you can find yourself laughing one minute, and sobbing the next.