From some of the negative comments I see about this manhwa, it seems that people do not understand that it's a "melodrama". Tearful confessions, traumatic pasts, misunderstandings - these are all part and parcel of the genre. Either you enjoy this kind of stuff (I do) or you don't. From that perspective, "The Friendly Winter" is an excellent example of the genre and also what is commonly called a "pure romance", or a romantic plot that focuses more on feelings of love and affection and not particularly on sexual romance.
Interestingly enough, despite the two main leads having disabilities, the drama actually focuses on normal family issues with their particular circumstances only standing in sometimes as a catalyst for very real and very normal issues that many people face in their life. Chief among these are feelings of abandonment, regret and frustration. It's one of the nice things about this manhwa - there are no villains here, just an assortment of good people who are trying their best to deal with difficult circumstances. Because of this, the drama and characters really come to life and draw you in to the ongoing plot.
On a technical level, while the story itself has some issues with both pacing and uneven tone (particularly it's noticeable when the author got contract extensions on the chapters), the characterizations remain compelling throughout and the beautiful full color artwork really keeps you engaged with the story.
If you're a fan of melodrama or tear-jerkers in general, then "The Friendly Winter" really delivers.