'Love Hormones'?

Never knew I could attend a lesson in Biology from an episode of Korean drama serial [我叫金三顺]. According to the male lead, there are three stages of LOVE. And these three stages will last around three to four years. That is why alot of couples break up during the fourth year of their relationships. So when a couple decides to spilt, it's not because of they are not suitable for each other. It's because of their hormones.

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我领悟了 ... =p