Drama with a grumpy character turns soft?

I'd say....(the character in each is the ML unless noted)

• 100 Days My Prince
• A Dream of Splendor 
• A Familiar Stranger
• Always Have, Always Will 
• Arang and the Magistrate 
• Back From the Brink 
• Bossam: Steal the Fate 
• Bulgasal: Immortal Souls 
• Doom at Your Service 
• Eternal Love of Dream 
• Faith
• First Romance
• From Now On, Showtime! 
• General's Lady 
• Heart of Loyalty (maybe Su Zui, too)
• Hello Mr. Gu 
• Honey, Don't Run Away 
• I Am the Years You Are the Stars 
• In the Day We Flipped 
• Just Between Lovers 
• Kabe Sa Doujin Sakka no Neko Yashiki-kun wa Shouninyokkyuu wo Kojiraseteiru (Nekoyashiki Mamoru)
• Koi wa Tsuzuku yo Doko Made mo 
• Love Between Fairy and Devil 
• Love Unexpected 
• My Dear Destiny 
• My Lady General (FL)
• My Sassy Princess 
• Not Me (Sean)
• Please Don’t Spoil Me 
• Princess at Large 
• Supervisor Husband 
• The King in Love (Wang Rin)
• The Love You Give Me 
• The Master's Sun 
• The Princess's Man (ML starts soft, turns grumpy/cruel, then goes soft again)
• The Queen of Attack 
• The Romance of Tiger and Rose 
• The Sweet Girl 
• The Untamed (Lan Zhan)
• Tomorrow (Park Joong Gil starts grumpy/hard then turns soft at the very end. I'd say also Goo Ryun)
• Twisted Fate of Love 
• Your Sensibility My Destiny 

The Untamed hands down for me.