乐观 (lèguān) Optimistic (advanced)
The character "乐 (lè)" means happy; "观 (guān)" means view.
Example:
Tā jíshǐ zài zuì zāogāo de shíhou yě zǒngshì fēicháng lèguān.
她 即使 在 最 糟糕 的 时候 也 总是 非常 乐观。
She was always optimistic, even when things were at their worst.