Week 5 inside the "Pinoy Big Brother Celebrity Collab Edition" house felt like something straight out of a K-Drama. With Korean actor Kim Ji Soo entering as a special guest, the vibe was infused with just the right amount of kilig and feel-good energy.

Housemates Will Ashley and Michael Sager were tasked with writing two original drama stories with Ji Soo as the main character. He had to deliver three Filipino lines in each act. For every line he uttered perfectly, the housemates earned the chance to remove one layer from their “hearts tower” challenge, wherein the housemates, divided into two groups, must stack a five-feet-tall tower of cups with a half-heart base on a floating platform. To win, the two groups must carry the platforms across the pool and bring them together to form a full heart.

With the "hearts tower" task, the housemates found themselves reflecting on what love truly means to them. 

Love isn’t always tender and sweet. At times, it hurts the most. And for Charlie Fleming, the most heartbreaking love story was her parents’ separation in 2015, and how her relationship with her dad has grown more distant in the recent years. It hurt, she admitted, but there was strength in choosing her own peace.

Meanwhile, AZ Martinez got candid about how her relationship with her boyfriend, fellow Kapuso artist Larkin Castor, has gone through on-and-off phases. She knows that no relationship is perfect, but she just wants a love that understands.

Viewers can watch "PBB Celebrity Collab Edition" online via live streams on Pinoy Big Brother's YouTube page, Kapamilya Online Live (KOL), iWantTFC and TFC.